Edexcel Paper 2 2021 October — Question 9

Exam BoardEdexcel
ModulePaper 2 (Paper 2)
Year2021
SessionOctober
TopicSequences and series, recurrence and convergence
  1. Show that
$$\sum _ { n = 2 } ^ { \infty } \left( \frac { 3 } { 4 } \right) ^ { n } \cos ( 180 n ) ^ { \circ } = \frac { 9 } { 28 }$$
VI4V SIHI NI SIIIM ION OCVIAV SIHI NI III IM I ON OCVJ4V SIHI NI IMIMM ION OC
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